Compensation of gravity on cold atoms by a linear optical potential

Shibata, Kosuke; Ikeda, Hidehiko; Suzuki, Ryota; Hirano, Takuya

doi:10.1103/physrevresearch.2.013068

Cited by 20 publications

(13 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By employing a linear optical potential (with a laser far detuned from the Yb-resonances), one may also reduce the effect of gravity and increase the time of flight [102]. Competing factors here are the initial separation and the mean-field interaction.…”

Section: B Entrainment Signalmentioning

confidence: 99%

Detecting Entrainment in Fermi-Bose Mixtures

Hossain,

Gupta,

Forbes

2021

Preprint

View full text Add to dashboard Cite

We propose an experimental protocol to directly detect the Andreev-Bashkin effect (entrainment) in the bulk mixture of a bosonic and fermionic superfluid using a ring geometry. Our protocol involves the interferometric detection of the entrainment-induced phase gradient across a superfluid due to the flow of another in which it is immersed. The choice of ring geometry eliminates variations in the stronger mean-field interaction which can thwart the detection of entrainment in other geometries. A significant enhancement of the entrainment phase shift signal is possible, if the dimer-boson scattering length turns out to be large, which can be measured by tuning the interaction to the limit of miscibility of the two superfluids. With suggested improvements and careful design implementation, one may achieve ≈ 67% shift in the interferometer fringes.

show abstract

Section: B Entrainment Signalmentioning

confidence: 99%

Detecting Entrainment in Fermi-Bose Mixtures

Hossain,

Gupta,

Forbes

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This allows to create box-like trapping schemes [53][54][55] for the preparation of homogeneous Dy-K mixtures. At a specific detuning, the polarizability ratio will match the mass ratio and an optical levitation scheme [56] can be realized that compensates the effect of gravity for both species simultaneously. In a harmonic trap, the phase diagram critically depends on the trap frequency ratio of both species, as investigated theoretically in Ref.…”

Section: Discussionmentioning

confidence: 99%

Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line

Kreyer,

Han,

Ravensbergen

et al. 2021

Preprint

View full text Add to dashboard Cite

We report on measurements of the anisotropic dynamical polarizability of Dy near the 626-nm intercombination line, employing modulation spectroscopy in a one-dimensional optical lattice. To eliminate large systematic uncertainties resulting from the limited knowledge of the spatial intensity distribution, we use K as a reference species with accurately known polarizability. This method can be applied independently of the sign of the polarizability, i.e. for both attractive and repulsive optical fields on both sides of a resonance. By variation of the laser polarization we extract the scalar and the tensorial part. To characterize the strength of the transition, we also derive the natural linewidth. We find our result in excellent agreement with literature values, which provide a sensitive benchmark for the accuracy of our method. In addition we demonstrate optical dipole trapping on the intercombination line, confirming the expected long lifetimes and low heating rates. This provides an additional tool to tailor optical potentials for Dy atoms and for the species-specific manipulation of atoms in the Dy-K mixture.

show abstract

“…This value increases as the vertical width of the horizontal ODT beam increases, resulting in a conflict between desires for both low trap frequency and low trap depth. This constraint can be lifted, however, by compensating the gravitational potential with an appropriately tuned linear optical potential in the trapping region [15]. Importantly, this technique is accessible for all atoms, including non-magnetic atoms such as ytterbium.…”

Section: Gravity Compensation By Shaped Optical Beammentioning

confidence: 99%

Interferometry in an Atomic Fountain with Ytterbium Bose–Einstein Condensates

Gochnauer

Rahman

Wirth-Singh

et al. 2021

Atoms

View full text Add to dashboard Cite

We present enabling experimental tools and atom interferometer implementations in a vertical “fountain” geometry with ytterbium Bose–Einstein condensates. To meet the unique challenge of the heavy, non-magnetic atom, we apply a shaped optical potential to balance against gravity following evaporative cooling and demonstrate a double Mach–Zehnder interferometer suitable for applications such as gravity gradient measurements. Furthermore, we also investigate the use of a pulsed optical potential to act as a matter wave lens in the vertical direction during expansion of the Bose–Einstein condensate. This method is shown to be even more effective than the aforementioned shaped optical potential. The application of this method results in a reduction of velocity spread (or equivalently an increase in source brightness) of more than a factor of five, which we demonstrate using a two-pulse momentum-space Ramsey interferometer. The vertical geometry implementation of our diffraction beams ensures that the atomic center of mass maintains overlap with the pulsed atom optical elements, thus allowing extension of atom interferometer times beyond what is possible in a horizontal geometry. Our results thus provide useful tools for enhancing the precision of atom interferometry with ultracold ytterbium atoms.

show abstract

Compensation of gravity on cold atoms by a linear optical potential

Cited by 20 publications

References 26 publications

Detecting Entrainment in Fermi-Bose Mixtures

Detecting Entrainment in Fermi-Bose Mixtures

Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line

Interferometry in an Atomic Fountain with Ytterbium Bose–Einstein Condensates

Contact Info

Product

Resources

About